题目内容（请给出正确答案）

[主观题]

Which of the following was an important invention in the 19th century？A．Movies with sound.

Which of the following was an important invention in the 19th century？

A．Movies with sound.

B．Nylon.

C．The radio.

D．The computer.

提问人：网友snowCrystal 发布时间：2022-01-06

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